By using data of Nobeyama radio heliograph, we calculate value of magnetic field in lower corona in some active region from thermal bremsstrahlung, and preliminary result has been obtained.

利用Nobeyama射电日像仪的观测资料，以热轫致辐射机制为基础对一些活动区的高层大气磁场进行了估算，得到了一些初步的结果。

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